pH对铝盐絮凝剂形态分布与混凝除氟性能的影响

96Vol．9No．620156ChineseJournalofEnvironmentalEngineeringJun．2015pH*100085AlCl33PAClpH。pH。pH5～6Al3+Al2、Al3AlCl3AlCl3A1OH3PACl。pH＞7PAClAlCl3PAClAl13PAClF－ζF－。PAClζX703．5A1673-9108201506-2563-06EffectofpHonaluminumspeciesdistributionandremovaloffluoridebydifferentAlcoagulantsJuJiaweiGaoYupingHeZanLiuＲuipingKeyLaboratoryofEnvironmentalAquaticChemistryＲesearchCenterforEco-EnvironmentalSciencesChineseAcademyofSciencesBeijing100085ChinaAbstractThisstudycomparedtheremovaloffluoridebyAlCl3andpolyaluminumchloridePAClatdif-ferentpHanddosagesandproposedthemechanismsaccordingly．TheresultsindicatethatpHhasabigimpactonthedefluoridationprocessduetodifferentaluminumspeciesinhydrolysisprocess．AtpH5～6AlCl3existsintheformofmonomerandsmallpolymericaluminumspeciesandshowsbetterperformanceinremovingfluoridethanPACl．HoweveratpH＞7PAClisbetterthanthatofAlCl3inremovaloffluoride．BesidesPAClwithalargervalueofOH/A13+isbetterfordefluoridationduetoaffinitybetweenAl13andfluoride．Higherζpo-tentialisbenefitfornegatively-chargedfluorideadsorbedonthesurfaceoftheflocsandleadstobetterperform-anceindefluoridationprocess．KeywordsfluoridePAClbasicityaluminumspeciesζpotential21177143211771442015ZX07402-0032014－05－072014－05－261989—。[e-mail]*[e-mail]1《》1．0mg/L2。3。、--、、、4-10。、、。、PACl。Al13PACl11。B=OH/A13+PACl。0312。、、。、9。AlCl33PAClAl-Ferron4pHpH。11．1NaF105℃2h0．2210g、1000mL100mg/LFNaF。4AlCl3·6H2OPACl12%Al2O3PACl210%Al2O3PACl330%Al2O3。PACl1200mL50mL1．0mol/LAlCl350mL2．4mol/LNaOH70℃。NaOHAlCl31h。24h0．209mol/L、B=2．4PACl1。1．2MY3000-61000mL200r/min30s200r/min1min40r/min15min30min2cm0．45μm。1．3GB15892-2003DMSTitrino716MetrohmAl2O3B。Al-Ferron4Ala、AlbAlc13U-3010HitachiCo．Japan。F－PF-1ICP-OESOptima2000PerkinElmerU．K．0．45μm。22．1pH4Al-FerronpH4Ala、AlbAlc1。AlCl3AlaAlbpHpH＜6AlapHAlbpHpH=6pH=7Ala10%Alb74．7%pHpH＞7AlapH8．6%75．5%AlbpH74．7%17．3%。pH4．0～9．0AlcAla。3PAClpH4～9Ala、AlbAlcAlCl3PAClAlCl3。PACl1、PACl2、PACl3PACl1＞PACl2＞PACl3PACl1、PACl2、PACl32．40、1．901．49。PACl。pH。Ala、AlbAlc3AlaAlbAlc。14ESI-MS4pH3．0～8．0。pHAlCl3。pH3．0Al2Al3Al4Al13。pH4．0Al2Al3pH=3．0。pH5．0Al2Al13。4PAClpH3．0～6．0AlCl3。pH3．0～6．0PACl1Al13Al1、Al2Al3Al13pH。PACl2PACl3ESI-MSpHPACl1pHAl1346526pH1pHAlCl3PAClAla、AlbAlcFig．1ＲatiosofAlaAlbandAlcforAlCl3andPAClatdifferentpHPACl1＞PACl2＞PACl3。2．2pHpH。10mg/L81mg/L。2apH3．0～11．0。AlCl3pH=694．7%pH6．03．038．1%pH6．011．020．1%。PACl1、PACl2PACl33PAClpH=7．092．9%、86．2%83．7%pH7．03．038．1%、38．1%35．4%pH11．049．7%、26．8%20．5%。AlCl3pHpH6．0～7．0PAClAlCl3pHpH6．0～8．0。2bAlCl3PAClpH6．0～8．0pH。AlCl3pH=6．0AlOH3pH=9．0AlOH3。PAClpH=7．0AlOH3。2AlCl3PAClpH3～11Fig．2ＲemovalrateoffluorideandconcentrationofresidualaluminumofAlCl3andPAClatpHinrangeof3～11pH=3～44。pH56AlCl3AlCl3PAClAlOH3。F－AlCl3Al2、Al315。pH694。AlOH3。、Al13PAClF－。AlCl3Al13。4PACl56529PACl1＞PACl2＞PACl3＞AlCl3。pH10．0A1OH3A1OH4－。2．33413．5mg/L108mg/LpH6．07．5。pH=6．0AlCl33PACl。0～60mg/LAlCl3AlCl3108mg/L94．7%。3PAClpHPAClPACl1＞PACl2＞PACl3。pH=7．5AlCl33PAClpH6．0。pH6．07．5AlCl3AlOH3、PAClpH。3Fig．3EffectofaluminumdosageofAlCl3andPAClonremovaloffluoride2．44a4pHζ。pH＜4．04ζAl3+Al2、Al3pH5．06．04ζpHAlCl3PAClζpH=6．0pH7．0AlCl3ζPAClpH=7．0。pH11．04ζAlCl3ζPACl。3PAClζPACl1＞PACl2＞PACl3。4pHζ4bＲ20．95。ζ。Al3OH5+4、Al7OH4+17、Al13O4OH7+24AlOH3am。ζ。4pHAlCl3PAClζζFig．4ζpotentialvariationoverwidepHrangesforfourcoagulantsandremovedfluorideplottedwithζpotentialforAlCl3andPAClatdifferentpH66526pH54。3460cm－1—OH1625cm－1—OHF－—OH。3PACl3460cm－11625cm－1PAClAl—OH16。54965cm－1590cm－1。965cm－1AlF2+、AlF+2AlF3。PAClAlCl3590cm－1965cm－1AlCl3PACl。5Fig．5FTIＲofAlCl3andPAClbeforeandafterdefluoridationprocesspH6。pH3～5/pH5～7．5AlOH3Al13/AlOH3。pH＞7．5AlOH3。6Fig．6SchematicdiagramofmechanismsfordefluoridationforAlindifferentforms3pH。pH5～6Al3+Al2、Al3AlCl3PAClAlCl3A1OH3。AlCl3。pH＞7PAClAlCl3PACl。4ζζ。1AyoobS．GuptaA．K．Fluorideindrinkingwaterareviewonthestatusandstresseffects．CriticalＲeviewsinEnviron-mentalScienceandTechnology2006366433-4872MohapatraM．AnandS．MishraB．K．etal．Ｒeviewoffluorideremovalfromdrinkingwater．JournalofEnviron-mentalManagement200991167-773MaJianqingShenYuShenChensietal．Al-dopingchi-tosan-FeIIIhydrogelfortheremovaloffluoridefroma-queoussolutions．ChemicalEngineeringJournal20142481598-1064ArarO．YavuzE．YukselU．etal．SeparationoflowconcentrationoffluoridefromwaterbyelectrodialysisED76529inthepresenceofchlorideandsulfateions．SeparationSci-enceandTechnology20094471562-15735ChangM．F．LiuJ．C．Precipitationremovaloffluoridefromsemiconductorwastewater．JournalofEnvironmentalEngineering20071334419-4256DengShuboLiuHanZhouWeietal．Mn-Ceoxideasahigh-capacityadsorbentforfluorideremovalfromwater．JournalofHazardousMaterials20111862-31360-13667WuXiaomeiZhangYuDouXiaominetal．Fluoridere-movalperformanceofanovelFe-Al-Cetrimetaloxidead-sorbent．Chemosphere200769111758-17648LuN．C．LiuJ．C．Ｒemovalofphosphateandfluoridefromwastewaterbyahybridprecipitation-microfiltrationprocess．SeparationandPurificationTechnology2010743329-3359KhatibikamalV．TorabianA．JanpoorF．etal．Fluor-ideremovalfromindustrialwastewaterusingelectrocoagula-tionanditsadsorptionkinetics．JournalofHazardousMate-rials20101791-3276-28010Dol